diff --git a/composer.json b/composer.json
index a2f08c159..d69a2ba76 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
         "silverstripe/mimevalidator": "^4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^11.3",
         "squizlabs/php_codesniffer": "^3",
         "silverstripe/documentation-lint": "^1",
         "silverstripe/standards": "^1",
diff --git a/tests/php/Control/UserDefinedFormControllerTest.php b/tests/php/Control/UserDefinedFormControllerTest.php
index 24d4e79b1..2cb09db4c 100644
--- a/tests/php/Control/UserDefinedFormControllerTest.php
+++ b/tests/php/Control/UserDefinedFormControllerTest.php
@@ -30,6 +30,7 @@
 use SilverStripe\View\ArrayData;
 use SilverStripe\View\SSViewer;
 use function filesize;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * @package userforms
@@ -525,7 +526,7 @@ public function testEmailAttachmentMaximumSizeCanBeConfigured()
         $this->assertSame(5 * 1024 * 1024, $udfController->getMaximumAllowedEmailAttachmentSize());
     }
 
-    public function getParseByteSizeStringTestValues()
+    public static function getParseByteSizeStringTestValues()
     {
         return [
             ['9846', 9846],
@@ -549,16 +550,14 @@ public function getParseByteSizeStringTestValues()
         ];
     }
 
-    /**
-     * @dataProvider getParseByteSizeStringTestValues
-     */
+    #[DataProvider('getParseByteSizeStringTestValues')]
     public function testParseByteSizeString($input, $expectedOutput)
     {
         $controller = new SizeStringTestableController(); // extends UserDefinedFormController
         $this->assertSame($expectedOutput, $controller->convertSizeStringToBytes($input));
     }
 
-    public function getParseByteSizeStringTestBadValues()
+    public static function getParseByteSizeStringTestBadValues()
     {
         return [
             ['1234b'],
@@ -572,9 +571,9 @@ public function getParseByteSizeStringTestBadValues()
     }
 
     /**
-     * @dataProvider getParseByteSizeStringTestBadValues
      * @expectedException \InvalidArgumentException
      */
+    #[DataProvider('getParseByteSizeStringTestBadValues')]
     public function testParseByteSizeStringBadValuesThrowException($input)
     {
         $this->expectException('\InvalidArgumentException');
@@ -582,7 +581,7 @@ public function testParseByteSizeStringBadValuesThrowException($input)
         $controller->convertSizeStringToBytes($input);
     }
 
-    public function provideValidEmailsToArray()
+    public static function provideValidEmailsToArray()
     {
         return [
             [[], [null]],
@@ -600,9 +599,9 @@ public function provideValidEmailsToArray()
     }
 
     /**
-     * @dataProvider provideValidEmailsToArray
      * Test that provided email is valid
      */
+    #[DataProvider('provideValidEmailsToArray')]
     public function testValidEmailsToArray(array $expectedOutput, array $input)
     {
         $class = new ReflectionClass(UserDefinedFormController::class);
diff --git a/tests/php/Form/UserFormsRequiredFieldsTest.php b/tests/php/Form/UserFormsRequiredFieldsTest.php
index 9aae7beae..9b45f96d2 100644
--- a/tests/php/Form/UserFormsRequiredFieldsTest.php
+++ b/tests/php/Form/UserFormsRequiredFieldsTest.php
@@ -8,6 +8,7 @@
 use SilverStripe\UserForms\Form\UserFormsRequiredFields;
 use SilverStripe\UserForms\Model\UserDefinedForm;
 use SilverStripe\UserForms\Form\UserForm;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class UserFormsRequiredFieldsTest extends SapphireTest
 {
@@ -29,7 +30,7 @@ public function testUsesUserFormsRequiredFieldsValidator()
         $this->assertInstanceOf(UserFormsRequiredFields::class, $validator, 'Uses UserFormsRequiredFields validator');
     }
 
-    public function dataProviderValidationOfConditionalRequiredFields()
+    public static function dataProviderValidationOfConditionalRequiredFields()
     {
         return [
             'Passes when non-conditional required field has a value' => [
@@ -62,8 +63,8 @@ public function dataProviderValidationOfConditionalRequiredFields()
     /**
      * @param $data
      * @param $expected
-     * @dataProvider dataProviderValidationOfConditionalRequiredFields
      */
+    #[DataProvider('dataProviderValidationOfConditionalRequiredFields')]
     public function testValidationOfConditionalRequiredFields($data, $expected)
     {
         $page = $this->objFromFixture(UserDefinedForm::class, 'required-custom-rules-form');
@@ -78,7 +79,7 @@ public function testValidationOfConditionalRequiredFields($data, $expected)
         $this->assertEquals($expected, $validator->php($data));
     }
 
-    public function dataProviderValidationOfNestedConditionalRequiredFields()
+    public static function dataProviderValidationOfNestedConditionalRequiredFields()
     {
         return [
             'Fails when non-conditional required field is empty' => [[], false],
@@ -133,8 +134,8 @@ public function dataProviderValidationOfNestedConditionalRequiredFields()
     /**
      * @param string $data
      * @param array $expected
-     * @dataProvider dataProviderValidationOfNestedConditionalRequiredFields
      */
+    #[DataProvider('dataProviderValidationOfNestedConditionalRequiredFields')]
     public function testValidationOfNestedConditionalRequiredFields($data, $expected)
     {
         $page = $this->objFromFixture(UserDefinedForm::class, 'required-nested-custom-rules-form');
diff --git a/tests/php/Model/EditableCustomRuleTest.php b/tests/php/Model/EditableCustomRuleTest.php
index e717cd39e..87c786024 100644
--- a/tests/php/Model/EditableCustomRuleTest.php
+++ b/tests/php/Model/EditableCustomRuleTest.php
@@ -4,6 +4,7 @@
 
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\UserForms\Model\EditableCustomRule;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * Class EditableCustomRulesTest
@@ -61,7 +62,7 @@ public function testToggleDisplayEvent()
         $this->assertSame('userform.field.hide', $rule1->toggleDisplayEvent('hide', true));
     }
 
-    public function dataProviderValidateAgainstFormData()
+    public static function dataProviderValidateAgainstFormData()
     {
         return [
             'IsNotBlank with blank value' =>
@@ -114,8 +115,8 @@ public function dataProviderValidateAgainstFormData()
     /**
      * Test that methods are returned for manipulating the presence of the "hide" CSS class depending
      * on whether the field should be hidden or shown
-     * @dataProvider dataProviderValidateAgainstFormData
      */
+    #[DataProvider('dataProviderValidateAgainstFormData')]
     public function testValidateAgainstFormData($condition, $targetValue, $value, $expected)
     {
         $rule1 = $this->objFromFixture(EditableCustomRule::class, 'rule1');
diff --git a/tests/php/Model/EditableFormField/EditableLiteralFieldTest.php b/tests/php/Model/EditableFormField/EditableLiteralFieldTest.php
index fa2753031..94931912a 100644
--- a/tests/php/Model/EditableFormField/EditableLiteralFieldTest.php
+++ b/tests/php/Model/EditableFormField/EditableLiteralFieldTest.php
@@ -59,7 +59,7 @@ public function testHideLabel()
     public function testLiteralFieldHasUpdateFormFieldMethodCalled()
     {
         $field = $this->getMockBuilder(EditableLiteralField::class)
-            ->setMethods(array('doUpdateFormField'))
+            ->onlyMethods(array('doUpdateFormField'))
             ->getMock();
 
         $field->expects($this->once())->method('doUpdateFormField');
diff --git a/tests/php/Model/EditableFormFieldTest.php b/tests/php/Model/EditableFormFieldTest.php
index 0e970540e..209cd5a52 100644
--- a/tests/php/Model/EditableFormFieldTest.php
+++ b/tests/php/Model/EditableFormFieldTest.php
@@ -15,6 +15,7 @@
 use SilverStripe\UserForms\Model\EditableFormField\EditableRadioField;
 use SilverStripe\UserForms\Model\EditableFormField\EditableTextField;
 use SilverStripe\UserForms\Model\EditableCustomRule;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * @package userforms
@@ -257,7 +258,7 @@ public function testGetIcon()
         $this->assertStringContainsString('/images/editabletextfield.png', $field->getIcon());
     }
 
-    public function displayedProvider()
+    public static function displayedProvider()
     {
         $one = ['basic_text_name' => 'foobar'];
         $two = array_merge($one, ['basic_text_name_2' => 'foobar']);
@@ -301,8 +302,8 @@ public function displayedProvider()
      * @param $fieldName
      * @param $data
      * @param $expected
-     * @dataProvider displayedProvider
      */
+    #[DataProvider('displayedProvider')]
     public function testIsDisplayed($fieldName, $data, $expected)
     {
         /** @var EditableFormField $field */